The influence of knee function to patella replacement and patellar plasty in totle knee arthroplasty

Objective To investigate the effects on knee function between patella plasty and patellar replacement in total knee arthroplasty.Methods From August 2010 to November 2010,48 patients (69 knees) of osteoarthritis performed TKA were covered in this study.All the patients were randomly assigned to the following two groups:one group contained 24 patients (34 knees) performed patella plasty,and the other group contained other 24 patients (35 knees) performed patellar replacement.There was no significant difference between the two groups in age,weight,height,BMI,patellar score and the American Knee Society Score (KSS).Every patient was followed up for 6 weeks,3 months,6 months,one year,and two years.All the results,which were used to compare the difference between the two groups,in KSS knee score,knee function score,patellar score,the incidence of anterior knee pain,and imaging findings.Results In this clinical study,20 patients (30 knees) in patellar replacement group and 20 patients (29 knees) in patella plasty group were followed up.No significant difference was found in the postoperative KSS knee score between 2 groups at each time point.The KSS knee function score in replacement group was significantly higher than that in arthroplasty group at 6,12 and 24 months after operation.The incidence of anterior knee pain after the surgery in replacement group was significant different from the plasty group at every time point after operation.There was no significant difference in tibiofemoral angle,patellar ligament ratio,patellar tilt angle,congruence angle and lateral patellar displacement between two groups at last follow-up.Conclusion Total knee arthroplasty with patella replacement can improve both knee function and patella function,and reduce the incidence of postoperative anterior knee pain. Key words: Arthroplasty, replacement, knee;  Patella;  Randomized controlled trials